How do you visualize your dataset via Web 2.0?

I mean create a line graph, stack graph, pie chart, bar chart, scatter plot, etc. out of your data. Of course you can produce/edit data via google spreadsheets, but how do you make visual sense of those data?

Now go to many-eyes.com. Should show you what I mean. You can even create discussion threads on the charts. It's an IBM project built around social software concepts.

Thanks to David De Jean for point the site out.